Remove double negative of ("Unregisterised", "NO")

The settings file has variable named Unregisterised which on most arches is sed to NO.

I propose that the variable be renamed to Registered (dropping the "ised" part as well) so that:

      Old                           New
("Unregisterised", "NO")   ->    ("Registered", "YES")
("Unregisterised", "YES")  ->    ("Registered", "NO")

Unless someone can come up with a good reason why it should stay as it is, I will submit a patch for this to phabricator.

Trac metadata

Trac field	Value
Version	7.11
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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